Cutter-grinding machine.



A. RI MURRAY.

CUTTER GRINDING MACHINE.

APPLICATION FILED NOV. 7, I9I3.

3 SHEETS-SHEET 1.

Patented Au Wifn .96

COLUMBIA PLANOGRAPH Co., w`AsHlNnToN. D. c.

A. R. MURRAY.

CUTTER GRlNnlNG MACHINE.

APPLICATION FILED NOV. 7. i913. 1,148,524. Patented Aug. 3,1915.

Ima/610507 caLUMBIA PLANOURAPH co..WAsH|NuTON, D. C.

A. R. MURRAY.

CUTTER GRINDING MACHINE.

APPLICATION FILED IIov. I, IsIs.

Patented Aug. 3, 1915.

3 SHEETS-SHEET 3- ARISTIDES R. MURRAY, 0F CINCINNATI, `OHIO, ASSIGNOR TO THE CINCINNATI GEAR CUTTING MACHINECOMPANY, OF CINCINNATI, OHIO, A CORPORATION OF OHIO.

CUTTER-GRINDING MACHINE.

Application filed November 7, 1913.

T0 all whom t may concern Be it known that I, Anis'rmns R. MURRAY, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Cutter-Grinding Machines, of which the following is a specication.

My invention relates to cutter grinding machines, applicable for instance in grind ing cutters of milling machines, hobbing cutters, and the like, and `is intended for such other uses which a machine of this character is capable of performing.

Machines of this character have heretofore usually been constructed with a slide on which the grinding wheel is located, this slide moving toward and from the cutter to be ground and having slide connection within the pan which contains the water and refuse, with the result that the slide-faces have been subjected to excessive wear by reason of action thereon by the fine particles of emery and steel dropping into the refuse-pan in the grinding operation.

In my improved device I locate thegrinding support for the slide at the outside of the refuse-pan, and also so construct the machine that the cutter being ground has reciprocating movement imparted to it, which enables me to position the grinding-wheel stationary, for permitting a more ready driving thereof, insuring a uniform rotation of the grinding wheel, and avoiding the minute jars incident to a reciprocating grinding-wheel, thereby insuring a higher finish in the product.

lt is a further object of my invention to provide novel means whereby adjustment of both the length of stroke and the position of stroke of the reciprocating part is accomplished.

It is a further object of my invention to provide novel adjustments for locating the cutter to be ground with relation to thegrinding-whe`el, and to provide novel backstop means for the cutter, and the invention will be further readily understood from the :following description and claims, and from the drawings, in which latter:

Figure l is a front elevation of my improved device, the column being partly broken away Fig. 2 is a left side elevation of the same. Fig. 3 is a right side elevation of the same.j Fig. 4 isa plan view of the Specification of Lettersvlatent.

Patented Aug. 3, 1915.

serial No. 799,747.

same. Fig. 54 is a vertical section taken on they line 5-5 of Fig. 4, showing the means for angular adjustment and clamping of the cutterssupport, the means for positioningv the apron on the slide, and the slide connection outside the refuse-pan. Fig. 6 is a detail in vertical cross-section taken on the line 6-6 of Fig. 4, showing the means for clamping the apron to the slide-member. Fig. 7 is a rear elevation of the tilting cut tersupport. Fig. 8 is a cross-section on the line 8-8 of Fig. 4, showingr a detail of the back-stop for the cutter. Fig. 9 is a detail plan view, partly in section, showing the means for determining proper lateral adjustment of the cutter-stud; and, Fig. 10 is a detail in side elevation of the cutter-studi 1l represents the frame or column, on which a suitable refuse-pan 12. is supported.

13 vis a shaft journaled in bearings 14 on a hollow pillow 15, the walls of the pillow forming part of the wall of the refuse-pan for retaining the water and 'refuse in the pan. The hollow 16 of the pillow permits a belt, shown at 17, to be received therethrough about a pulley 18 on the shaft 13 for permitting the shaft to be driven from below and enabling a self-contained structure to be provided in such manner that the pulley on the grindingwheel shaft may be located between bearings within the vertical projection of the refuse-pan, thereby per-4 mitting a strong and compact construction.

A grinding-wheel 21 is secured to the shaft 13 in suitable manner, as by a releasable nut 22. A hoocl23 isreceived about the upper portion of the grinding-wheel and is pivoted to the refuse-pan by apin 24 re.- ceived through a bearing 25 on the hood and lugs 26 on the pan. Heels 27 on the hood contact the wall of the refuse-pan when the hoody is in down-position, the hood being arranged to be swung about 4the axis of' the pin 24 for exposing thegrindingwheel, the

Vrear lower portion of the hood being open,

as shown at 28, to accomplished.

31 isa cutter-stud for centering the cutter to be ground, indicated 'at 32, suitable bushpermit this swinging to be ings, `one of which is shown at 33, being provided to be received about the stud' for acrefuse-pan,'an apron 36 extending into the refuse-pan from the slide-member, and a cutter-support 37`on which the-cutter is received and which has "on it the stud 31. The cutter-support is moved back and forth with relation to the grinding-wheel, the guiding support for the cutter-support being outside the refuse-pan.A The slide-member has sliding connection with a slide-guide 40, shown formed on the outer face of the wall of the refuse-pan, and is indicated as an upright slide-guide. Suitabley means, to be hereinafter described, are provided for movino' .the slide-member back and forth.

iThe apron 36 extends into the refuse-'pan from the slide-member, an adjustable connection being shownbetween said apron and slide-member, this adjustmentv being provided to enable the axis ofthe cutter to be adjusted in line with the plane of the grinding face of the grinding cutter, so that, whenthe grinding takes place, the faces of the cutter teeth may always be ground radial to the cutter, so as to preserve the cutting contour of the cutter, it being understood that the cutters are usually of the solid type having relieved cutter teeth. This yadjustment is accomplished in the present exempliiication, by providing the top of the slide-member with a tongue or tongues 41 coperating with grooves 42 in a shelf 43 of the apron, one of the side faces of the tongues being provided with rack teeth 44.

A-pinion 45 on a removable stem 46, received journalwise in a bearing 47 in the shelf, coacts with the rack teeth for moving the apron laterally. Bolts 48 are received through slots 49 in the apron and have threaded'connection with threaded holes 50 in the slide-member for permitting lateral adjustment of the apron and for clamping the apron in adjusted positions, a washer 51 being received between the nuts 52 on said bolts and the upper endsv of the walls ofsaid slots. v l

The grinding-wheel may be andusually is a cup-shaped wheel, as indicated-by the hollow 19 thereof. The grinding-face of the wheeli's the outer end-face 20 of the Wheel, this grinding-face' extending in a plane at right angles to the axis of rotation of the shaft 13. This grinding-face is maintainedl in its true plane if necessary by redressing. In order to conveniently position the axis of the stud 31, and consequently of ythe"cu`.tter received thereabout, in the plane of the grinding-face of the grinding-wheel, I provide the stud 31 with a contact-face 29 which is coincident with that axial plane of thestud which is parallel tothe said plane of lthegrinding-face of the grinding-wheel, so that a straight-edge 30, `as indicated in` Fig. 9, may be placed across the grindingface 2,0 of the grinding-wheel, and the said contact-face 29`be brought into contact with said straight-edge by adjusting the cuttersupport laterally, for locating the axis of said stud and the cutter received thereover in the plane of the grinding-face of the grinding-wheel. This contact-face is shown as formed by a rabbet 38 in the upper end of the stud.

The support 37 has rocking movement about a shaft 54, which is shown received through a bearing 55 in the apron and bearings 56 in the support, the shaft having a threaded end 57 about which a nut 5S is threaded for clamping the apron and support together between said nut andthe head 59 of said shaft. (See Fig. 5). The apron and support have coacting slide faces 60 for permitting rocking movement of the support. This rocking movement is shown accomplished by means of an arm 61 suitably secured to and extending from the support.

The angular positioning of the support about its rocking axis raises or lowers the tooth to be presented tothe grinding-wheel and enables the cutter to be presented in line with the horizontally projected radius of the grinding-wheel or at an angle to said radius, above or below said radius, the latter positions of the cutter enabling the teeth of the cutter to be ground at both sides of the usual webs between the bases of its teeth and enabling heavy pitch cutters to be ground in the corners at the sides of the teeth.

I have provided novel positioning means for the tooth of the cutter being ground, whereby the back of the tooth is supported and the position of the tooth is determined with relation to the grinding-wheel. I prefer to make these positioning means movable with the cutter and have shown the same mounted on the cutter-support and as having movement with the cutter-support in the refuse-pan. Thus I provide the cutter-support with an extension 63 which y has an undercut slot 64 lengthwise thereof,

from which bolts 65 extend. A bracket 66 is adjustable lengthwise of said slot and has a tongue 67 received in the mouth of the undercut slot for preventing turning of said bracket. The bolts 65 are received through suitable holes in `the base of said bracket, nuts 68 clamping the bracket in adjusted position to the extension.

. The bracket comprises a shank 69 about which a collar 70 is received. The collar is prevented from turning on the shank as by means of a spline-connection 71. It is arranged to be adjusted lengthwise of the f shank and is secured in adjusted positions by a pivot connection 77, the paw being normally brought into the path of the teeth of the cutter by means of a spring 78, the ends of which are secured respectively to the tail 79 of the pawl-bloclr and to said collar. In indexing the j cutter, its teeth strike the inclined back 80 of the pawl for` causing ready yielding of the pawl. A setscrew 81 having threaded 'connection with the tail 79 contacts the collar for determining the position of the tooth-contacting face of the pawl, and provides means whereby the block is swung on its pivot so that the depth to which the faces of the teeth are ground is determined with extreme accuracy.

I have provided novel means for moving the cutter-slide toward and from the grinding-cutter, and novel adjustments therefor by which the extentl of reciprocating movement and the position of the path of movement may be adjusted. Thus I provide the slide-member 35 with a rack 83 with which a segment-rack 84 meshes. This segmentrack or actuating rack is on a lever 85 which vhas a bearing 86 about a rock-shaft 87. This rock-shaft is journaled in bearings 88 of the main frame and is provided with an operating arm 89 rigid thereon for rocking the same.

Means are provided for adjustably positioning the segment-rack 84 about the axis of the rock-shaft 87. Thus I providethe segment-rack with teeth 91 with which teeth 92 on a collar 93 coact, forming a clutch, the collar being urged toward the segmentrack by a spring 94 received in a recess 95 in said collar between a shoulder 96 on said shaft and the bottom of said recess, the collar being prevented from rotating on said shaft by spline-connection 97. (See Fig. 1.) The rock-shaft has a shoulder 98 thereon, the segment-rack being positioned endwise between said collar and the adjacent bearing 88. j

A stop 101 is arranged to contact the main frame. It is shown as an arm` extending from a hub 4102, rigidly secured to the rockshaft. The hub has teeth 103 thereon, which coact with teeth 104 on the hub 105 of an arm 106, the teeth forming a clutch. The hub 105 is rotatively received about the rock-shaft and is urged toward the hub 102 by means of a spring 107 received about said rock-shaft in a cup 108 rigidly secured to the rock-shaft. (See Fig. 1.)

The arm 106 has a threaded bearing 109 thereon, through which an adjusting screw 110 is received, the end whereof is arranged to contact a suitable point, shown as the bottom of the refuse-pan, acting as a stop. The arm 106 may be pushed laterally against the resistance of the spring 107 and swing about the rock-shaft, changing the relation between the arms 106, 101. The less the angularity is between said arms, the greater will be the range of reciprocating move-y ment of the slide `34, this adjustment being preferably employed for large-step adjustments. If minute adjustments are desired after the large-step adjustment has been made, this is accomplished by means of the adjusting screw 110. j

The stop-arm 101 determines the position of the cutter at the limit of its movement distanced from the grinding-wheel. This limit need not be exact, as it is provided mainly for clearance of the grinding-wheel by the teeth of the cutter in indexing the cutter. The limit of movement of the cut ter toward the grinding-wheel must however be usually exactly determined, and is determined by the minute adjustments obtained through the adjusting screw 110.

My improved device provides means for grinding cutters of greatly varying diameters. In orderto avoid the necessity of retreating small cutters as great a distance as large cutters, I provide means for adjusting the location of the path of the cutter in its reciprocating movements. This is accomplished by means of the adjustment provided for the segment-rack, which is adjustable about the axis of the operating shaft.

y If a location of path of movement of the cutter is desired which is closely adjacent to the grinding-wheel, `the collar 93 is pulled outwardly and the slide 34 is moved toward the grinding-wheel through the operation of the lever 85, which changes the relation between the segment-rack and the collar and also the relation between the segment-rack and the shaft.

When the parts are properly adjusted in my improved device, a minimum movement of the operating arm will be required for effecting the reciprocating movement between the cutter-support and the grindingwheel, and the operating arm may be located for having a path most convenient for the operator, irrespective of the size of the cutter being ground.

The Huid for the grinding-wheel is fed through a `suitable spout 111.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a cutter grinder, the combination of a refuse-p an, a grinding-wheel rotatable therein, a cutter-support in said refuse-pan, and means causing right-line approach and recession between said grinding-wheel and cutter-support comprising a right-line guiding support outside the refuse-containing walls of said refuse-pan. f

2. In a cutter grinder, the combination of a refuse-pan, a grinding-wheel arranged to rotate therein, a cutter-support coacting with said grinding-wheel, an apron extending into said refuse-pan, said cutter-support mounted on said apron, right-line supporting guiding means for said apron located outside the refuse-containing walls. of said refuse-pan, and means for reciprocating said apron. Y

' 3. In a cutter grinder, the combination of a refuse-pan, a grinding-wheel having a grinding-face rotatable' in said refuse-pan, a

slide, a cutter-support in said refuse-pan, a'y

said cutter-support on said slide-member,

and right-line guiding means outsider the refuse-containing walls ot said refuse-pan, cooperating with said slide-member.

5. In a cutter grinder, the combination of a'refuse-pan, a slide comprising a cuttersupport, an apron and a slide-member, a

slide-guide for said slide-member located `outside the refuse-containing Walls of saidrefuse-pan, said apron depending from sald slide-member within said reuse-contalning' walls, and saidV said apron.

' 6. In a'cutter grinder, the combination of cutter-support pivoted to a grinding-wheel and vacutter-support, and

means for causing reciprocation between said cutter-support and grinding-wheel comprising a slide, a rockable member, a rack having connection with said slide, a cooperating segment, and a clutch between said segment and rockable member for adjustably conneeting said segment to said rockable member in various positions about the aXis of said rockable member. v

7. In a cutter grinder, the combination of a grinding-wheel and a cutter-support, and means for causing reciprocation between said cutter-support and grinding-wheel comprising a slide, a rockable member, a lever rockable about said rockable member, said lever having a segment thereon coacting with said rack, aclutch between said rockable member and rockable lever for adjustably connecting kthe same, and adjustable stopping means limiting the rocking movement of saidv rockable member.

8... In a cutter grinder, the combination of j for adjusting said segment about said rockshaft for adjusting the angular relation between said segment and said stop-arms.

9. In a cutter grinder, the combination of a grinding-wheel and a cutter-support, and means for causing reciprocation between said cutter-support and grinding-wheel comprising a slide, a rock-shaft, a stop-arm on said rock-shaft for limiting recession between said cutter-support and grinding-wheel, a stop-arm on said rock-shaft for limiting approach between said cutter-support and grinding-wheel, a screw-adjustment for the latter, and means comprising a clutch for adjusting the angular distance between said arms, and connecting means between said rock-shaft and slide for reciprocating the latter. Y 10. In a cutter grinder, the combination of a grinding-wheel and a cutter-support, and means for causing reciprocation between said cutter-support and grinding-wheel comprising a slide, a rock-shaft, a stop-arm on said rock-shaft for limiting recession between said cutter-support and grindingvwheel, a stop-arm on said rock-shaft for tension rigid therewith, a bracket adjust-4 able lengthwise 'of said extension toward andl from said cutter-support, a shank eX- tending from said bracket parallel to the axis of said shaft, a collar adjustable lengthwise of said shank, and apawl pivoted to said collar arranged to contact the backs of the teeth of said cutter.

l2. In a cutter grinder, agrinding-wheel having an end grinding-face which is in a plane atright angles to the axis of rotation of said wheel, anda cutter-receiving stud provided with a contact-face which is coincident with that aXial plane of said stud which is parallel to said end grinding-face, and means for lateral adjustment of said stud for locating said planes coincident, whereby a straight-edge parallel to and in contact with said end grinding-face will form a contact-part for said contact-face on said stud.

13.y In a cutter grinder, the combination with a grinding-wheel having an end grinding-face, a cutter-support,` a stud thereon arranged to receive a cutter to be ground, and means for causing approach and recession between said cutter-support and grinding-wheel, of means for locating said end grinding-face and the axis of said stud in coincident parallel planes, and a back-stop for the cutter comprising a contact-tooth coacting with the teeth of said cutter, a pivoted block on which said tooth is located, and an adjusting means whereby said block is swung on its pivot and the location of said contact-tooth is adjusted.

14:. In a cutter grinder, the combination of a refuse-pan, a grinding-wheel rotatable therein, a shaft therefor, a pulley on said shaft, a cutter-support in said refuse-pan, means for causing approach and recession between said grinding-wheel and cutter-support comprising a right-line guiding support outside the refuse-containing walls of said refuse-pan, and a hollow pillow on which said shaft is journaled extending into the vertical projection of said refuse-pan and arranged for receiving a driving belt therethrough from below over said pulley, the walls of said pillow forming part of the refuse-containing walls of said refusep 15. In a cutter grinder, the combination of a refuse-pan, a slide comprising a cuttersupporting part located in said refuse-pan, and a slide-guide for said slide located on the outer face of the wall of said refuse-pan.

16. ln a cutter-grinder, the combination of a refuse-pan, a grinding-wheel rotatable therein, a slide comprising a slide-member and a cutter-supporting bracket having a cutter-supporting part, said cutter-supporting part located in said refuse-pan, adjusting means between said slide-member and bracket comprising right-line guiding means for adjusting said cutter-supporting part laterally with relation to said grindingwheel, means for moving said slide in rightlines toward and from said grinding-wheel comprising right-line guiding means, said last-named right-line guiding means and said right-line guiding means between said slide-member and bracket located outside said refuse-pan.

In testimony whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

ARISTIDES R. MURRAY.

Witnesses:

NATHANIEL H. MAXWELL, THERESA M. SILBER.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents. Washington, D. C. 

